saundebs



(No Model.)

l W- L. SAUNDBRS.

DRILL HEAD POR GHANNELING lszIAGHIIYIBS.` N0. 320,295. Patented June 16, 1885.l

UNiTED STATES PATENT rrcit'.'

WILLIAM L. SAUNDERS, OF JERSEY CITY, NEV JERSEY.

DRILL-HEAD FOR CHANNELlNG-MACHINES.

SPECIFICATION forming p'art of Letters Patent No.320,295, dated June 16, 1885.

To @ZZ whom/it 17m/y concern: A

Be it known that I, WM. L. SAUNDERs, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in DrilIHeads 101 Stone Cutting Machines, of which the following isa specification, reference being had to the accompanying drawings.

The object of the present imenlion is to provide an improved form of drill-head or clamp which will prevent the difficulty experienced with clamps in which t-he drills are placed in an offset or depression in the clamp and are held in place by means of a taper key resting against one end of the drill-receiving depression, the force of the blows tending to bend the clamp out of line. As this strain is always exerted in one direction, the clamps gradually warp and become useless.

My improved clamp is formed with countersunk faces on opposite sides of the clamp, so that it is made reversible and may be used with the drills in one face or the other at different times, thus keeping the clamp straight and counteracting its tendency to warp. I also provide an improved form of clamp-bolt in order to facilitate the changing of the drills.

In the clamps generally in use the bolts are common round bolts, which pass through holes made in both the cross-head and the clamp. A nut on'each bolt serves to bind the. clamp and drills to the cross-head. In drilling stoneas, for instance, sandstone, where the gage of the drills is rapidlyworn away by the grit-it becomes necessary to change the drills every few minutes. Considerable time is occupied in unscrewing the nuts and taking the bolts out of the clamp.

My improved clamp-bolt is attached to the side or in the ends of the clamp by being inserted in suitable slots therein. The bolt is made rectangular in section where it passes through the slots, thus preventing it being turned when the nuts are being set by the wrench. Vith this form of bolt I am able to change the drills by simply turning t-he nut sufiiciently to loosen it, andthen removing the bolts sidewise, thus releasing the clamp and the drills from the cross-head. This `also enables me to use lock-nuts on the bolts, which prevent their being jarred loose by the blows.

(No model.)

In the case of my improved elampbolts it is evident that the nuts have merely to be slackened in order to release the bolt, instead of having to be unscrewed entirely from the bolts before they can be withdrawn and the clamp removed.

In the accompanying drawings, Figure l is a plain view of my improved drilLclamp. Fig. 2 is a view in elevation of Fig. l. Fig. 3 is an elevation showing the method of attaching` the drill-clamp to the cross-head.

Similar letters denote like parts.

The drill clamp or head A differs from that already in use in that the counter-sink B, which is formed in its face for the reception of one or a series of drills, E, which are secured in position by a key, F, is reproduced on the other side of the clamp, as shown in Fig. l, and it isprovided with open notches orslots, as shown at a, for the reception of the square-shanked bolts C, which are used as heretofore described.

D is a cross-head, which is secured to the pistou-rod G or other motor, and is formed .with notches d in its sides or ends, or in both, which said slots or notches register with those in the drill clamp or head A, and are squared for the reception of the clamp-bolts C.

As shown, the drill head or clamp is provided with a flange or lip, H, extending from the sides thereof, so as to project under the cross-head or other portion of the drill-engine to which it may be attached. This, however, I do not claimin the present application, and I contemplate using the reversible drillhead hereinbefore described, with or without the lip or ange, as may be found most convenient in practice.

Having described my invention, what I claim is- 1. rlhe combination, with two or more drills of a stone-channeling machine, of a clamp having shoulders or recess against which the drills are forced by a tapered key, said shoulders or recess being formed on opposing faces of the clamp, whereby the clamp is made reversible, substantially as described.

2. A drill-clamp having drill-receiving depressions or recesses formed with longitudinal plane surfaces against which the drills rest, and within which they are secured by suitable key engaging between the shoulders of said drill-receiving recess7 and formed with notches l In testimony whereof I hereto afx my sgro at its ends or sides for the recept-ion of supportnature in presence of two Witnesses.

ing-bolts, substantially as set forth.

3. The combination/With the piston of a stone-cutting machine, of a cross-head formed with notches in the ends o1' sides thereof, a

VILLIAM L. SAUNDERS.

Vitnesses:

ter with the notches in the cross-head, and the drill-clamp having notches adapted to regis HUNTINGTON PAGE, clamping boit7 substantially as described. i

J. OUYAT. 

